Boston Marathon logo
BOSTON MARATHON 2023

Briton Demars

Bib: 4268•M

UT

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 24%
Gender (Male)
#0 / 15176
Top 37%
Division (M18-39)
#0 / 5285
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:29
Rank: #7713
Start → 5K
22:29 | 7:14/mi
10K· 6.21 mi
45:03
Rank: #8107 (-394)
5K → 10K
22:34 | 7:16/mi
15K· 9.32 mi
1:07:28
Rank: #8027 (+80)
10K → 15K
22:25 | 7:13/mi
20K· 12.43 mi
1:29:57
Rank: #7813 (+214)
15K → 20K
22:29 | 7:14/mi
Half· 13.11 mi
1:34:49
Rank: #7779 (+34)
20K → Half
4:52 | 7:08/mi
25K· 15.53 mi
1:52:02
Rank: #7444 (+335)
Half → 25K
17:13 | 7:06/mi
30K· 18.64 mi
2:13:53
Rank: #6883 (+561)
25K → 30K
21:51 | 7:02/mi
20M
2:23:06
Rank: #6544 (+339)
30K → 20M
9:13 | 6:47/mi
21M
2:30:10
Rank: #6290 (+254)
20M → 21M
7:04 | 7:04/mi
35K· 21.75 mi
2:35:08
Rank: #6168 (+122)
21M → 35K
4:58 | 6:38/mi
23M
2:43:53
Rank: #5958 (+210)
35K → 23M
8:45 | 6:59/mi
24M
2:51:14
Rank: #5931 (+27)
23M → 24M
7:21 | 7:21/mi
40K· 24.85 mi
2:58:05
Rank: #6021 (-90)
24M → 40K
6:51 | 8:01/mi
25.2M
3:01:11
Rank: #6093 (-72)
40K → 25.2M
3:06 | 8:59/mi
Finish· 26.22 mi
3:09:42
Rank: #6352 (-259)
25.2M → Finish
8:31 | 8:21/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:34:49
Pace7:14 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:34:53
Pace7:14 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:24:3622:297:1422:29
7:14
-
10K
6.21 mi10:47:1045:037:1522:34
7:16
+0:02
15K
9.32 mi11:09:351:07:287:1422:25
7:13
-0:03
20K
12.43 mi11:32:041:29:577:1422:29
7:14
+0:01
Half
13.11 mi11:36:561:34:497:144:52
7:08
-0:06
25K
15.53 mi11:54:091:52:027:1317:13
7:06
-0:02
30K
18.64 mi12:16:002:13:537:1121:51
7:02
-0:04
20M
20.00 mi12:25:132:23:067:099:13
6:47
-0:15
21M
21.00 mi12:32:172:30:107:097:04
7:04
+0:17
35K
21.75 mi12:37:152:35:087:084:58
6:38
-0:26
23M
23.00 mi12:46:002:43:537:088:45
6:59
+0:21
24M
24.00 mi12:53:212:51:147:087:21
7:21
+0:22
40K
24.85 mi13:00:122:58:057:106:51
8:01
+0:40
25.2M
25.20 mi13:03:183:01:117:113:06
8:59
+0:58
Finish
26.22 mi13:11:493:09:427:148:31
8:21
-0:38

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

6:38 /mi

Average Pace

7:14 /mi

Slowest Pace

8:59 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

14:11

7% of race

Time at Steady Pace

2:37:03

83% of race

Time at Slower Pace

18:28

10% of race

Average Pace: 7:14 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:24:3622:297:1422:29
7:14
#7713
10K
6.21 mi10:47:1045:037:1522:34
7:16
#8107
15K
9.32 mi11:09:351:07:287:1422:25
7:13
#8027
20K
12.43 mi11:32:041:29:577:1422:29
7:14
#7813
Half
13.11 mi11:36:561:34:497:144:52
7:08
#7779
25K
15.53 mi11:54:091:52:027:1317:13
7:06
#7444
30K
18.64 mi12:16:002:13:537:1121:51
7:02
#6883
20M
20.00 mi12:25:132:23:067:099:13
6:47
#6544
21M
21.00 mi12:32:172:30:107:097:04
7:04
#6290
35K
21.75 mi12:37:152:35:087:084:58
6:38
#6168
23M
23.00 mi12:46:002:43:537:088:45
6:59
#5958
24M
24.00 mi12:53:212:51:147:087:21
7:21
#5931
40K
24.85 mi13:00:122:58:057:106:51
8:01
#6021
25.2M
25.20 mi13:03:183:01:117:113:06
8:59
#6093
Finish
26.22 mi13:11:493:09:427:148:31
8:21
#6352
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi7713678567857884(Top 30%)6839(Top 45%)6839(Top 129%)
10K6.21 mi3.10 mi8107-3947024-2397024-2398552(Top 32%)7291(Top 48%)7291(Top 138%)
15K9.32 mi3.11 mi8027+806969+556969+557884(Top 30%)6839(Top 45%)6839(Top 129%)
20K12.43 mi3.11 mi7813+2146818+1516818+1517326(Top 28%)6442(Top 42%)6442(Top 122%)
Half13.11 mi0.68 mi7779+346788+306788+307326(Top 28%)6446(Top 42%)6446(Top 122%)
25K15.53 mi2.42 mi7444+3356559+2296559+2296114(Top 23%)5527(Top 36%)5527(Top 105%)
30K18.64 mi3.11 mi6883+5616124+4356124+4354577(Top 17%)4239(Top 28%)4239(Top 80%)
20M20.00 mi1.36 mi6544+3395863+2615863+2612738(Top 10%)2592(Top 17%)2592(Top 49%)
21M21.00 mi1.00 mi6290+2545662+2015662+2012498(Top 9%)2361(Top 16%)2361(Top 45%)
35K21.75 mi0.75 mi6168+1225561+1015561+1013267(Top 12%)3052(Top 20%)3052(Top 58%)
23M23.00 mi1.25 mi5958+2105387+1745387+1743754(Top 14%)3468(Top 23%)3468(Top 66%)
24M24.00 mi1.00 mi5931+275357+305357+306707(Top 25%)5546(Top 37%)5546(Top 105%)
40K24.85 mi0.85 mi6021-905417-605417-6010081(Top 38%)7362(Top 49%)7362(Top 139%)
25.2M25.20 mi0.35 mi6093-725464-475464-4712331(Top 46%)8394(Top 55%)8394(Top 159%)
Finish26.22 mi1.02 mi6352-2595652-1885652-18814406(Top 54%)9426(Top 62%)9426(Top 178%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 30%
×21stories
+97ft-345ft

Overall

7884

Males

6839

M18-39

6839

5K→10K

3.1 - 6.2 mi

Top 32%
×5stories
+79ft-138ft

Overall

8552

Males

7291

M18-39

7291

10K→15K

6.2 - 9.3 mi

Top 30%
×3stories
+67ft-78ft

Overall

7884

Males

6839

M18-39

6839

15K→20K

9.3 - 12.4 mi

Top 28%
×5stories
+106ft-86ft

Overall

7326

Males

6442

M18-39

6442

20K→Half

12.4 - 13.1 mi

Top 28%
×2stories
+19ft-37ft

Overall

7326

Males

6446

M18-39

6446

Half→25K

13.1 - 15.5 mi

Top 23%
×4stories
+66ft-88ft

Overall

6114

Males

5527

M18-39

5527

25K→30K

15.5 - 18.6 mi

Top 17%
×9stories
+181ft-148ft

Overall

4577

Males

4239

M18-39

4239

30K→20M

18.6 - 20.0 mi

Top 10%
×5stories
+64ft-50ft

Overall

2738

Males

2592

M18-39

2592

20M→21M

20.0 - 21.0 mi

Top 9%
×8stories
+106ft-24ft

Overall

2498

Males

2361

M18-39

2361

21M→35K

21.0 - 21.8 mi

Top 12%
×7stories
+17ft-86ft

Overall

3267

Males

3052

M18-39

3052

35K→23M

21.8 - 23.0 mi

Top 14%
×5stories
+23ft-63ft

Overall

3754

Males

3468

M18-39

3468

23M→24M

23.0 - 24.0 mi

Top 25%
×6stories
+12ft-82ft

Overall

6707

Males

5546

M18-39

5546

24M→40K

24.0 - 24.9 mi

Top 38%
×1story
+6ft-20ft

Overall

10081

Males

7362

M18-39

7362

40K→25.2M

24.9 - 25.2 mi

Top 46%
×1story
+13ft-16ft

Overall

12331

Males

8394

M18-39

8394

25.2M→Finish

25.2 - 26.2 mi

Top 54%
×2stories
+22ft-21ft

Overall

14406

Males

9426

M18-39

9426

Passing Analysis

Category:
Athletes Passed
2477
Passed By
1116
Net Change
+1361
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#7713
5K → 10K85479-394#7713#8107
10K → 15K17595+80#8107#8027
15K → 20K23723+214#8027#7813
20K → Half439+34#7813#7779
Half → 25K3383+335#7779#7444
25K → 30K5632+561#7444#6883
30K → 20M3390+339#6883#6544
20M → 21M2540+254#6544#6290
21M → 35K1231+122#6290#6168
35K → 23M2111+210#6168#5958
23M → 24M6134+27#5958#5931
24M → 40K32122-90#5931#6021
40K → 25.2M577-72#6021#6093
25.2M → Finish11270-259#6093#6352
TOTALS24771116+1361
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing